The influence of humans on the climate is clear and evident in most regions, according to an assessment by the Intergovernmental Panel on Climate Change (IPCC; Stockholm). Global warming is unequivocal, and human influence extremely likely the dominant cause since 1950, according to the summary for policymakers of the IPCC Working Group I (WGI), Climate Change 2013: The Physical Science Basis. Many changes have been observed since 1950 that are unprecedented over decades or millennia, says the report. Evidence for climate warming has grown during the...